From a current National Geographic story on Arlington National Cemetary:

"In section 60 the raw graves of the dead from Iraq and Afghanistan are appointed with little amulets for the next world: a ceramic fortune cookie; a bottle of beer; a spent 9-mm brass cartridge; a sliver of agate from the fallen soldier's native Kentucky; laminated photos of wives, sweethearts, children. On a smooth stone, a message neatly printed in indelible ink could crack the hardest heart: 'I love you, Daddy. Happy birthday.' "